Armchair



FIG. 1 is a front perspective view of an armchair showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is view taken from the left side; the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view; and,

FIG. 5 is a top plan view. 

The ornamental design for an armchair, as shown and described. 